| Year | Protected | Not Protected | Protected % |
| 2009 | 28 | 4 | 87.50 |
| 2010 | 24 | 8 | 75.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 34 | 0 | 100.00 |
| 2016 | 35 | 0 | 100.00 |
| 2017 | 36 | 0 | 100.00 |
| 2018 | 22 | 15 | 59.46 |
| 2019 | 33 | 5 | 86.84 |
| 2020 | 9 | 30 | 23.08 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| 2024 | 0 | 42 | 0.00 |
| Totals | 353 | 217 | 61.93 |